Voltage adapter



FIG. 1 is a front, right side and bottom end perspective view of a voltage adapter showing my new design;

FIG. 2 is a rear, left side and bottom end perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top end view thereof; and,

FIG. 8 is a bottom end view thereof. 

The ornamental design for a voltage adapter, as shown and described. 